General Characteristics

• Crew: five (pilot, copilot/navigator, radio operator/gunner, two gunners)
• Length: 44 ft 10 in (13.67 m)
• Wingspan: 69 ft 10 in (21.29 m)
• Height: 13 ft 7 in (4.14 m)
• Wing area: 684 sq ft (63.5 m²)
• Airfoil: NACA 23018/NACA 23009
• Empty weight: 13,376 lb (6,067 kg)
• Gross weight: 17,333 lb (7,862 kg)
• Max takeoff weight: 21,625 lb (9,809 kg)
• Fuel capacity: 400 US gal (1,500 L)
• Powerplant: 2 × Allison V-1710-9 liquid-cooled turbosupercharged V-12, 1,090 hp (810 kW) each
• Propellers: three-bladed

Performance

• Maximum speed: 277 mph (446 km/h, 241 kn)
• Cruise speed: 244 mph (393 km/h, 212 kn)
• Range: 2,600 mi (4,200 km, 2,300 nmi)
• Service ceiling: 30,500 ft (9,300 m)
• Rate of climb: 1,480 ft/min (7.5 m/s)

Armament

• Guns: ** 2 × 37 mm (1.46 in) M4 cannons (110 rpg)
  • 2 × .30 in (7.62 mm) M1919 Browning machine guns in front of nacelles
  • 2 × .50 in (12.7 mm) M2 Browning machine guns (600 rpg) in side blisters
• Bombs: 20 × 30 lb (14 kg) fragmentation bombs in wing bays

• XFM-1 (Model 1) Prototype powered by two 1,150 hp V-1710-13 engines, one (38-351) built.
• YFM-1 (Model 7) Development aircraft powered by two 1,150 hp V-1710-23 engines and fitted with 37 mm cannons in wing nacelles, eight built, two later converted to YFM-1B.
• YFM-1A (Model 8) Development aircraft with tricycle landing gear, three built.
• YFM-1B YFM-1 re-engined with 1,090 hp V-1710-41 engines, two converted from YFM-1.
• YFM-1C (Model 17) – proposed variant not proceeded with.